Syringes filled with the Pfizer-BioNTech COVID-19 vaccine are shown in April at the Christine E. Lynn Rehabilitation Center in Miami.

FILE – This April 15, 2021, file photo syringes filled with the Pfizer COVID-19 vaccine are shown at the Christine E. Lynn Rehabilitation center in Jackson Memorial hospital in Miami. With vaccination rates lagging in red states, Republican leaders have begun stepping up efforts to persuade their supporters to get the shot, at times combating misinformation spread by some of their own. (AP Photo/Wilfredo Lee, File)